#ifndef _ADFS_FS_H
#define _ADFS_FS_H

#include <linux/types.h>
#include <linux/magic.h>

/*
 * Disc Record at disc address 0xc00
 */
struct adfs_discrecord {
	__u8 log2secsize;
	__u8 secspertrack;
	__u8 heads;
	__u8 density;
	__u8 idlen;
	__u8 log2bpmb;
	__u8 skew;
	__u8 bootoption;
	__u8 lowsector;
	__u8 nzones;
	__le16 zone_spare;
	__le32 root;
	__le32 disc_size;
	__le16 disc_id;
	__u8 disc_name[10];
	__le32 disc_type;
	__le32 disc_size_high;
	__u8 log2sharesize:4;
	__u8 unused40:4;
	__u8 big_flag:1;
	__u8 unused41:1;
	__u8 nzones_high;
	__le32 format_version;
	__le32 root_size;
	__u8 unused52[60 - 52];
};

#define ADFS_DISCRECORD		(0xc00)
#define ADFS_DR_OFFSET		(0x1c0)
#define ADFS_DR_SIZE		 60
#define ADFS_DR_SIZE_BITS	(ADFS_DR_SIZE << 3)

#ifdef __KERNEL__
#include <linux/adfs_fs_i.h>
#include <linux/adfs_fs_sb.h>
/*
 * Calculate the boot block checksum on an ADFS drive.  Note that this will
 * appear to be correct if the sector contains all zeros, so also check that
 * the disk size is non-zero!!!
 */
static inline int adfs_checkbblk(unsigned char *ptr)
{
	unsigned int result = 0;
	unsigned char *p = ptr + 511;

	do {
		result = (result & 0xff) + (result >> 8);
		result = result + *--p;
	} while (p != ptr);

	return (result & 0xff) != ptr[511];
}

static inline struct adfs_sb_info *ADFS_SB(struct super_block *sb)
{
	return sb->s_fs_info;
}

static inline struct adfs_inode_info *ADFS_I(struct inode *inode)
{
	return container_of(inode, struct adfs_inode_info, vfs_inode);
}

#endif

#endif
